SEISMIC DESIGN PARAMETERS for New Buildings at San Bernardino Valley College, San Bernardino, California

Total Page：16

File Type：pdf, Size：1020Kb

SEISMIC DESIGN PARAMETERS for New Buildings at San Bernardino Valley College, San Bernardino, California PROJECT DESCRIPTION San Bernardino Valley College (SBVC) is built on the San Bernardino Valley segment of the San Jacinto fault. The right-lateral strike-slip San Jacinto fault is thought capable of generating an upper bound earthquake (UBE) of moment magnitude Mw=7.3. Earth Consultants International (ECI) was asked to study the seismically induced ground motions at the SBVC site. The purpose of the project was to quantify the strong ground motion anticipated at SBVC due to local earthquakes. We explored the code-based methodology using a 10% probability of exceedance in 100 years. This is the definition of UBE which the California Geological Survey recommended at that time for critical structures. We also looked at fault-specific San Bernardino Valley College in relation to earthquakes and ground motions that could cause the major Quaternary faults in the region damage at SBVC. SOLUTION ECI determined an upper bound earthquake for SBVC based on geologic, tectonic, kinematic and seismo lo gical facto rs. We calcu lated th e probabilistic peak horizontal acceleration (PGA) and spectral acceleration with a 10 percent probability of exceedance in 100 years for all faults within 100 km of SBVC using site-specific data and published attenuation relationships. We developed 5 percent damped, uniform risk design response spectra, and compared it to the California Building Code (CBC) and International Council of Building Officials (ICBO) design code standards in effect then. International strong ground motion databases were searched to obtain time history records of ground displacements caused by recent large Average 5% damped uniform response spectra and earthquakes near the site, and source parameters spectra for different attenuation relations pertinent to SBVC. The ground motion estimates obtained for SBVC are high compared to many other parts of southern California because the campus is built directly on the San Jacinto fault zone and within 6 km of the San Andreas fault. Therefore, SBVC must be prepared for very strong ground motions at the campus. 1642 E. Fourth Street • Santa Ana • California • 92701 714.544.5321 • www.earthconsultants.com.

Copy Link

Recommended publications

Introduction San Andreas Fault: an Overview
Introduction This volume is a general geology field guide to the San Andreas Fault in the San Francisco Bay Area. The first section provides a brief overview of the San Andreas Fault in context to regional California geology, the Bay Area, and earthquake history with emphasis of the section of the fault that ruptured in the Great San Francisco Earthquake of 1906. This first section also contains information useful for discussion and making field observations associated with fault- related landforms, landslides and mass-wasting features, and the plant ecology in the study region. The second section contains field trips and recommended hikes on public lands in the Santa Cruz Mountains, along the San Mateo Coast, and at Point Reyes National Seashore. These trips provide access to the San Andreas Fault and associated faults, and to significant rock exposures and landforms in the vicinity. Note that more stops are provided in each of the sections than might be possible to visit in a day. The extra material is intended to provide optional choices to visit in a region with a wealth of natural resources, and to support discussions and provide information about additional field exploration in the Santa Cruz Mountains region. An early version of the guidebook was used in conjunction with the Pacific SEPM 2004 Fall Field Trip. Selected references provide a more technical and exhaustive overview of the fault system and geology in this field area; for instance, see USGS Professional Paper 1550-E (Wells, 2004). San Andreas Fault: An Overview The catastrophe caused by the 1906 earthquake in the San Francisco region started the study of earthquakes and California geology in earnest.
[Show full text]
Region of the San Andreas Fault, Western Transverse Ranges, California
Thrust-Induced Collapse of Mountains— An Example from the “Big Bend” Region of the San Andreas Fault, Western Transverse Ranges, California By Karl S. Kellogg Scientific Investigations Report 2004–5206 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior Gale A. Norton, Secretary U.S. Geological Survey Charles G. Groat, Director U.S. Geological Survey, Reston, Virginia: 2004 For sale by U.S. Geological Survey, Information Services Box 25286, Denver Federal Center Denver, CO 80225 For more information about the USGS and its products: Telephone: 1-888-ASK-USGS World Wide Web: http://www.usgs.gov/ Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. iii Contents Abstract ……………………………………………………………………………………… 1 Introduction …………………………………………………………………………………… 1 Geology of the Mount Pinos and Frazier Mountain Region …………………………………… 3 Fracturing of Crystalline Rocks in the Hanging Wall of Thrusts ……………………………… 5 Worldwide Examples of Gravitational Collapse ……………………………………………… 6 A Spreading Model for Mount Pinos and Frazier Mountain ………………………………… 6 Conclusions …………………………………………………………………………………… 8 Acknowledgments …………………………………………………………………………… 8 References …………………………………………………………………………………… 8 Illustrations 1. Regional geologic map of the western Transverse Ranges of southern California …………………………………………………………………………… 2 2. Simplified geologic map of the Mount Pinos-Frazier Mountain region …………… 2 3. View looking southeast across the San Andreas rift valley toward Frazier Mountain …………………………………………………………………… 3 4. View to the northwest of Mount Pinos, the rift valley (Cuddy Valley) of the San Andreas fault, and the trace of the Lockwood Valley fault ……………… 3 5.
[Show full text]
Nehrp Final Technical Report
NEHRP FINAL TECHNICAL REPORT Grant Number: G16AP00097 Term of Award: 9/2016-9/2017, extended to 12/2017 PI: Whitney Maria Behr1 Quaternary geologic slip rates along the Agua Blanca fault: implications for hazard to southern California and northern Baja California Abstract The Agua Blanca and San Miguel-Vallecitos Faults transfer ~14% of San Andreas-related Pacific-North American dextral plate motion across the Peninsular Ranges of Baja California. The Late Quaternary slip histories for the these faults are integral to mapping how strain is transferred by the southern San Andreas fault system from the Gulf of California to the western edge of the plate boundary, but have remained inadequately constrained. We present the first quantitative geologic slip rates for the Agua Blanca Fault, which of the two fault is characterized by the most prominent tectonic geomorphologic evidence of significant Late Quaternary dextral slip. Four slip rates from three sites measured using new airborne lidar and both cosmogenic 10Be exposure and optically stimulated luminescence geochronology suggest a steady along-strike rate of ~3 mm/a over 4 time frames. Specifically, the most probable Late Quaternary slip rates for the Agua Blanca Fault are 2.8 +0.8/-0.6 mm/a since ~65.1 ka, 3.0 +1.4/-0.8 mm/a since ~21.8 ka, 3.4 +0.8/-0.6 mm/a since ~11.8 ka, and 3.0 +3.0/-1.5 mm/a since ~1.6 ka, with all uncertainties reported at 95% confidence. These rates suggest that the Agua Blanca Fault accommodates at least half of plate boundary slip across northern Baja California.
[Show full text]
A Pattern of Seismicity in Southern California: the Possibility of Earthquakes Triggered by Lunar and Solar Gravitational Tides
A Pattern of Seismicity in Southern California: The Possibility of Earthquakes Triggered by Lunar and Solar Gravitational Tides David Nabhan Helen Keller wrote that the heresy of one age is the orthodoxy of the next, giving ample proof that although sightless, she possessed extraordinary vision. Moreover, it has been said that every new fact must pass through a crucible by which first it is ignored or ridiculed, then vigorously attacked, and finally accepted as though the truth had been apparent from the beginning. Earthquake prediction is no exception but for the anomaly that the first two stages have endured far longer than what the immense populations on the U.S. West Coast might hope to expect regarding a matter so important to their safety and welfare. Residents of Southern California have been left with a bewildering set of claims and counter-claims regarding this issue for many decades. While scientific data Seismic Gap Probabilities. Author's collection. can be presented any number of ways to say any number of things, there is another arbiter that, weighed alongside the conflicting findings, may allow fair-minded observers to come to their own cogent conclusions: history. There exists a long and verifiable record of events on the Pacific Coast and elsewhere David Nabhan, SDSU alumnus, is the author of Earthquake Prediction: Answers in Plain Sight (2012) and two other books on the subject. He is directing a public opinion campaign to impel the governor of California to convene the California Earthquake Prediction Evaluation Council for the purposes of determining the viability or fallibility of a seismic safety plan.
[Show full text]
Geologic, Climatic, and Vegetation History of California
GEOLOGIC, CLIMATIC, AND VEGETATION HISTORY OF CALIFORNIA Constance I. Millar I ntroduction The dawning of the “Anthropocene,” the era of human-induced climate change, exposes what paleoscientists have documented for decades: earth’s environment—land, sea, air, and the organisms that inhabit these—is in a state of continual flux. Change is part of global reality, as is the relatively new and disruptive role humans superimpose on environmental and climatic flux. Historic dynamism is central to understanding how plant lineages exist in the present—their journey through time illuminates plant ecology and diversity, niche preferences, range distributions, and life-history characteristics, and is essential grounding for successful conservation planning. The editors of the current Manual recognize that the geologic, climatic, and vegetation history of California belong together as a single story, reflecting their interweaving nature. Advances in the sci- ences of geology, climatology, and paleobotany have shaken earlier interpretations of earth’s history and promoted integrated understanding of the origins of land, climate, and biota of western North America. In unraveling mysteries about the “what, where, and when” of California history, the respec- tive sciences have also clarified the “how” of processes responsible for geologic, climatic, and vegeta- tion change. This narrative of California’s prehistory emphasizes process and scale while also portraying pic- tures of the past. The goal is to foster a deeper understanding of landscape dynamics of California that will help toward preparing for changes coming in the future. This in turn will inform meaningful and effective conservation decisions to protect the remarkable diversity of rock, sky, and life that is our California heritage.
[Show full text]
216166963.Pdf
SEISMOLOGICAL RESEARCH ISSUES IN THE SAN DIEGO REGION Thomas H. Heaton and Lucile M. Jones U.S. Geological Survey 525 S. Wilson Ave. Pasadena, CA 911 04 June 1989 INTRODUCTION What is the nature of earthquake ground motions that can be expected in San Diego's foreseeable future? Although this is the most basic of questions underlying the adequate design of structures to resist earthquakes, answers to this question are disturbingly uncertain. A reasonable assumption is that future earthquake ground motions will be similar to those that have occurred in the past. When compared with San Francisco or Los Angeles, San Diego has historically experienced relatively mild earthquake shaking. Unfortunately, San Diego's written history is very short compared to the time scales of earthquake repetition. Are there sources of earthquakes that may cause damage in San Diego and what is their frequency? Mapping of geologic structures and the study of patterns of small earthquakes are the primary tools for recognizing potentially active faults. There are features in both the geologic structure and the seismicity that are suggestive of major active faults that could pose a serious hazard to San Diego. Furthermore, there is evidence that the rate of occurrence of small earthquakes has increased within the last 5 years when compared with the previous 50 years. However, these features are not well studied or understood. Even if the potential sources of earthquakes were well understood, the problem of anticipating the range of future ground motions is difficult. The nature of shaking from earthquakes is strongly affected by the nature of seismic wave propagation through complex geologic structures (path effects).
[Show full text]
1. NEOGENE TECTONICS of SOUTHERN CALIFORNIA . the Focus of This Research Project Is to Investigate the Timing of Rotation of T
1. NEOGENE TECTONICS OF SOUTHERN CALIFORNIA. The focus of this research project is to investigate the timing of rotation of the Transverse Ranges and the evolution of the 3-D architecture of the Los Angeles basin. Objectives are to understand better the seismicity of the region and the relationships between petroleum accumulations and the structure and stratigraphic evolution of the basin. Figure 1 shows the main physiographic and structural features of the Los Angeles basin region, the epicenter of recent significant earthquakes and the our initial study area in the northeastern Los Angeles basin. Los Angeles basin tectonic model: Most tectonic models attribute the opening of the Los Angeles basin to lithospheric extension produced by breakaway of the Western Transverse Ranges from the Peninsular Ranges and 90 degrees or more of clockwise rotation from ca. 18 Ma to the present. Evidence of this extension includes crustal thinning on tomographic profiles between the Santa Ana Mountains and the Santa Monica Mountains and the presence in the Los Angeles basin of Middle Miocene volcanic rocks and proto-normal faults. Detailed evidence of the 3-D architecture of the rift created by the breakaway and the timing of the rift phase has remained elusive. The closing of the Los Angeles basin in response to N-S contraction began at ca. 8 Ma and continues today (Bjorklund, et al., 2002). A system of active faults has developed that pose significant seismic hazards for the greater Los Angeles region. Crustal heterogeneities that developed during the extension phase of basin development may have strongly influenced the location of these faults.
[Show full text]
Imperial Irrigation District Final EIS/EIR
Final Environmental Impact Report/ Environmental Impact Statement Imperial Irrigation District Water Conservation and Transfer Project VOLUME 2 of 6 (Section 3.3—Section 9.23) See Volume 1 for Table of Contents Prepared for Bureau of Reclamation Imperial Irrigation District October 2002 155 Grand Avenue Suite 1000 Oakland, CA 94612 SECTION 3.3 Geology and Soils 3.3 GEOLOGY AND SOILS 3.3 Geology and Soils 3.3.1 Introduction and Summary Table 3.3-1 summarizes the geology and soils impacts for the Proposed Project and Alternatives. TABLE 3.3-1 Summary of Geology and Soils Impacts1 Alternative 2: 130 KAFY Proposed Project: On-farm Irrigation Alternative 3: 300 KAFY System 230 KAFY Alternative 4: All Conservation Alternative 1: Improvements All Conservation 300 KAFY Measures No Project Only Measures Fallowing Only LOWER COLORADO RIVER No impacts. Continuation of No impacts. No impacts. No impacts. existing conditions. IID WATER SERVICE AREA AND AAC GS-1: Soil erosion Continuation of A2-GS-1: Soil A3-GS-1: Soil A4-GS-1: Soil from construction existing conditions. erosion from erosion from erosion from of conservation construction of construction of fallowing: Less measures: Less conservation conservation than significant than significant measures: Less measures: Less impact with impact. than significant than significant mitigation. impact. impact. GS-2: Soil erosion Continuation of No impact. A3-GS-2: Soil No impact. from operation of existing conditions. erosion from conservation operation of measures: Less conservation than significant measures: Less impact. than significant impact. GS-3: Reduction Continuation of A2-GS-2: A3-GS-3: No impact. of soil erosion existing conditions.
[Show full text]
SSC 306 Thompson
1 San Andreas and Other Fault Sources; Background Source SSC TI Team Evaluation Steve Thompson Diablo Canyon SSHAC Level 3 PSHA Workshop #3 Feedback to Technical Integration Team on Preliminary Models March 25-27, 2014 San Luis Obispo, CA PG&E DCPP SSHAC Study PG&E DCPP SSHAC Study 2 Overview of the Preliminary SSC Model SSC Elements: Key Fault Sources San Andreas and Other Regional Fault Sources Background Source PG&E DCPP SSHAC Study 3 San Andreas and Other Fault Sources San Andreas Fault Other 200-Mile Site Region Faults Goal: Goals: Capture maximum Complete SSC within 200-mi contribution of SAF Site Region Confirm past results about contribution of “other” faults PG&E DCPP SSHAC Study 4 San Andreas Fault Approach: Approximate UCERF3 Characterization Ten Sections in 200-mi Matched a composite “Participation MFD” Overestimates UCERF3 Solution PG&E DCPP SSHAC Study 5 San Andreas Fault Source Composite Participation MFD: P SC CR Pf Ch Cz BB MN MS (SB) = 1 2 3 4 5 6 7 8 9 풊 7.0, = 9 ( ) 푀 ≤ 푅푅푅푅푇푇푇푇푇 푀 � 푅푅푅푅푖 푀 푖=1 PG&E DCPP SSHAC Study 6 San Andreas Fault Source Composite Participation MFD: P SC CR Pf Ch Cz BB MN MS (SB) = 1 2 3 4 5 6 7 8 9 풊 = 1 2 3 4 5 풌 7.0 < 7.5, = 5 ( ) 푀 ≤ 푅푅푅푅푇푇푇푇푇 푀 � 푅푅푅푅푘 푀 푘=1 PG&E DCPP SSHAC Study 7 San Andreas Fault Source Composite Participation MFD: P SC CR Pf Ch Cz BB MN MS (SB) = 1 2 3 4 5 6 7 8 9 풊 = 1 2 3 4 5 풌 = 1 2 3 풏 > 7.5, = 3 ( ) 푀 푅푅푅푅푇푇푇푇푇 푀 � 푅푅푅푅푛 푀 푛=1 PG&E DCPP SSHAC Study 8 San Andreas Fault Source Composite Participation MFD: P Ch MS P CR Ch BB MS P SC CR Pf Ch Cz BB MN MS (SB) = 1 2
[Show full text]
May 6, 2017 Demo
IMPERIAL COUNTY AIR POLLUTION CONTROL DISTRICT https://en.wikipedia.org/wiki/Coyote_Mountains#/media/File:Coyote_Mountains.png May 6, 2017 Exceptional Event Documentation For the Imperial County PM10 Nonattainment Area An exceedance of the National Ambient Air Quality Standard (NAAQS) for PM10 at the Brawley, Calexico, El Centro, Niland and Westmorland monitor in California on May 6, 2017 May 6, 2017 Exceptional Event, Imperial County Table of Contents TABLE OF CONTENTS SECTION PAGE I Introduction .................................................................................................................................. 1 I.1 Public Notification [40 CFR §50.14(c)(1)] .............................................................. 3 I.2 Initial Notification of Potential Exceptional Event (INPEE) (40 CFR §50.14 (c)(2)) ................................................................................................... 3 I.3 Public Comment Process [40 CFR §50.14(c)(3)(v)(A-C)] .................................. 4 I.4 Mitigation of Exceptional Events [40 CFR §51.930] .......................................... 4 II Conceptual Model – A narrative that describes the event causing the exceedance and a discussion of how emissions from the event led to the exceedance at the affected monitor .................................................................................... 9 II.1 Description of the event causing the exceedance ............................................ 9 II.2 How emissions from the event led to an exceedance ...................................
[Show full text]
EARTHQUAKE San Diego Danger Zones
Article Published by “San Diego Reader”, Vol. 29, No. 9, March 2, 2000 EARTHQUAKE San Diego Danger Zones Ten years ago, the California Division of Mines and Geology came up with a scenario for what would happen if a magnitude 6.8 quake occurred on the Silver Strand Fault. Interstate 5 would “be closed from Balboa Avenue on the north to Palm Avenue on the south,” the report predicted. “Both I-5 and old Route 101 will also be closed where they cross each of the coastal lagoons south of Oceanside…. The Coronado Bridge will be closed.... For planning purposes, San Diego International Airport will be closed for all but emergency or vital operations for a period of two weeks due to liquefaction affecting runways, access, electric power supply…. Service along the [railway] line from Los Angles can be expected to be disrupted south of Oceanside… for three weeks after the earthquake.” Other predictions in the planning scenario added detail to the grim picture. Major SDG&E transmission substations “are particularly vulnerable to damage by earthquake shaking,” and conductor lines swinging together could cause many “burn downs.” Furthermore, “for planning purposes, the South Bay Power Plant should be considered to be out of operation for three days and at a significantly reduced capacity for one and a half weeks following the scenario earthquake.” Water mains bordering Mission Bay and San Diego Bay, the coastal areas, western Mission Valley, and the Otay Valley “will suffer several breaks per mile of pipe. Landslides in the Mt. Soledad area, coastal regions of La Jolla, the north wall of Mission Valley, and the edges of Otay Mesa may also damage facilities and distribution mains.
[Show full text]
Appendix N—Grand Inversion Implementation and Testing
Appendix N—Grand Inversion Implementation and Testing By Morgan T. Page1, Edward H. Field1, Kevin R. Milner2, and Peter M. Powers1 Abstract We present results from an inversion-based methodology developed for the third Uniform California Earthquake Rupture Forecast (UCERF3) that simultaneously satisfies available slip- rate, paleoseismic event-rate, and magnitude-distribution constraints. Using a parallel simulated- annealing algorithm, we solve for the long-term rates of all ruptures that extend through the seismogenic thickness on major mapped faults in California. In this system-level approach, rupture rates, rather than being prescribed by experts as in past models, are derived directly from data. The inversion methodology enables the relaxation of fault segmentation and allows for the incorporation of multi-fault ruptures, which are needed to remove magnitude-distribution misfits that were present in the previous model, UCERF2. In addition to UCERF3 model results, we present verification of the inversion methodology, including sensitivity tests, convergence metrics, and a synthetic test. Introduction The evaluation of earthquake rupture forecasts in California dates back to the original Working Group on California Earthquake Probabilities (WGCEP; 1988), which considered the probabilities of future earthquakes on different segments of the San Andreas Fault. The most recent California model, UCERF2 (Working Group on California Earthquake Probabilities, 2007), used expert opinion to determine the rates of ruptures on many of the major faults. This expert opinion framework is not compatible with the incorporation of significant numbers of multi-fault ruptures on a large, complex fault system. Furthermore, in UCERF2 methodology, there was no way to simultaneously constrain that the model fit both observed paleoseismic event rates and fault slip rates.
[Show full text]